SOUND SIGNAL SYNTHESIS METHOD, GENERATIVE MODEL TRAINING METHOD, SOUND SIGNAL SYNTHESIS SYSTEM, AND RECORDING MEDIUM

A method generates first pitch data indicating a pitch of a first sound signal to be synthesized; and uses a generative model to estimate output data indicative of the first sound signal based on the generated first pitch data. The generative model has been trained to learn a relationship between second pitch data indicating a pitch of a second sound signal and the second sound signal. The first pitch data includes a first plurality of pieces of pitch notation data corresponding to pitch names, and is generated by setting, from among the first plurality of pieces of pitch notation data, a first piece of pitch notation data that corresponds to the pitch of the first sound signal as a hot value based on a difference between a reference pitch of a pitch name corresponding to the first piece of pitch notation data and the pitch of the first sound signal.